Description: A table listing the MIB tables from the registered MIB tables in tmtRegistrationTable that had their data modified.

There will only be one entry per registered MIB table that had a modification in its data. If a registered MIB table had many modifications, tmtHistTableLastModified of the entry corresponding to that registered table will be updated to the time when the last change occurred.

This table allows the NMS to find out, in one operation:

- If data in a given MIB table for an owner has changed. - If so, when did the last change occur. - And, the count of changes that occurred in the table. (Each SNMP Set request, CLI command or an internal process state change that causes modification in MIB table data is counted as one change. Although they may affect multiple rows in a MIB table.)

Using this info the NMS can choose to:

- Do nothing if the last change time is older than the time it polled this table last. - Check if the count of changes in the MIB table data is greater than this value at the previous poll plus any modifications done by this NMS.

If this is false, it indicates there have been no modifications done by other managers. So, the NMS does not have to do anything. - Look into the tmtHistRowModifTable to find the rows that have changed since the last poll and only download the newly modified rows. - Or Download the entire table.